Home >Backend Development >C++ >Explaining donut like ears old Part-2
To multiply singleRow and a matrix, in C we will create a function and in Java, we will create a public static function in Matrix
In C
singleRow multiply(singleRow m1, Matrix m2) { singleRow res; res.a1 = (m1.a1 * m2.a1.a1) + (m1.a2 * m2.a2.a1) + (m1.a3 * m2.a3.a1); res.a2 = (m1.a1 * m2.a1.a2) + (m1.a2 * m2.a2.a2) + (m1.a3 * m2.a3.a2); res.a3 = (m1.a1 * m2.a1.a3) + (m1.a2 * m2.a2.a3) + (m1.a3 * m2.a3.a3); return res; }
In Java
class Matrix { public static singleRow multiply(singleRow m1, Matrix m2) { singleRow res = new singleRow(0, 0, 0); res.a1 = (m1.a1 * m2.a1.a1) + (m1.a2 * m2.a2.a1) + (m1.a3 * m2.a3.a1); res.a2 = (m1.a1 * m2.a1.a2) + (m1.a2 * m2.a2.a2) + (m1.a3 * m2.a3.a2); res.a3 = (m1.a1 * m2.a1.a3) + (m1.a2 * m2.a2.a3) + (m1.a3 * m2.a3.a3); return res; } }
Let screen height = 22 and width = 80
total area = 1760
A = 0, B = 0
A is angle for rotation on X-axis, B is angle for rotation on Z-axis, when we rotate circle on Y-axis, it becomes donut
ϕ for Y-axis, θ for creating circle
create 2 arrays of 1760, 1 that stores donuts characters to print, other that stores z index maybe in double type
double zBuffer[1760]; char buffer[1760];
create a new screen with printf("x1b[2J");
and add infinite loop
while (1) { }
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